#include <iostream>
using namespace std;
void hello(void)
{
    cout << "hello world." << endl;
}
int main(void)
{
    cout << "hello world" << endl;
    int ind = 0;
    cout << "hello world1" << endl;
    cout << "hello world2" << endl;
    cout << "hello world3" << ind << endl;
    cout << "hello world4" << endl;
    for (int i = 0; i < 8; ++i)
    {
        hello();
        cout << "cur i is: " << i << endl;
    }

    return 0;
}